- Feature #622: Bidomain model implemented. - Support #721: Simplify Elastic and Hyperelastic variational formulations (remove template parameters introduced to deal with FSI as well). - Feature #718: Rewrite solid variational formulations for FSI. Using versions from Elastic and Hyperelastic models was not that good an idea, as the updating of quantities was not done at the same moments. - Bug #717: Hyperelastic half-sum wasn't fit to be used more than once ain a given time iteration. - Feature #713: Check in an example (fork of FSI with two meshes) HappyHeart can handle two meshes seamlessly.